RHDS - High DB locks usage when the Referential Integrity plugin is enabled.

Solution Verified - Updated -

Issue

The RHDS instance runs out of DB locks during LDAP update operations.
These are the typical error messages in the errors log:

[05/May/2020:14:03:10.389741470 +0200] - ERR - id2entry - db error 12 (Cannot allocate memory)
[05/May/2020:14:03:10.391192839 +0200] - ERR - ldbm_back_next_search_entry_ext - next_search_entry db err 12
[05/May/2020:14:03:10.392725298 +0200] - ERR - libdb - BDB2055 Lock table is out of available lock entries
[05/May/2020:14:03:10.394284112 +0200] - ERR - id2entry - db error 12 (Cannot allocate memory)
[05/May/2020:14:03:10.395875506 +0200] - ERR - ldbm_back_next_search_entry_ext - next_search_entry db err 12
[05/May/2020:14:03:10.397305021 +0200] - ERR - libdb - BDB2055 Lock table is out of available lock entries

Environment

Red Hat Directory Server 10
Red Hat Enterprise Linux 7.x
Red Hat Directory Server 11
Red Hat Enterprise Linux 8.x

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